JP2019207169A - Opening part block structure of radiation shield wall - Google Patents

Abstract

To provide an opening part block structure of a radiation shield wall which can rigidly integrate the radiation shield wall and a reinforced concrete body for blocking an opening part of the radiation shield wall.SOLUTION: An opening part block structure of a radiation shield wall blocks a rectangular opening part 10 formed at the radiation shield wall 1 for blocking a radial ray. An opening frame 20 extending along four sides of the opening part 10, and a reinforced concrete body 30 for blocking the opening part 10 including the opening frame 20 are arranged at the opening part 10 of the radiation shield wall 1. The opening frame 20 comprises a frame main body 21 for covering an end face constituting the opening part 10, a reinforced joint part 22 arranged at the frame main body 21, and an anchoring reinforcement 23 joined to the reinforced joint part 22, and anchored into the radiation shield wall 1. The reinforced concrete body 30 comprises a concrete part 31 for blocking the opening part 10, and a wall reinforcement 32 buried into the concrete part 31, and joined to the reinforced joint part 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a structure for closing an opening of a radiation shielding wall that shields radiation.

Conventionally, in a nuclear facility, a radiation shielding wall is provided to shield radiation emitted from a radiation source. The radiation shielding wall is provided with an opening for loading / unloading the apparatus and monitoring the radiation source. The following structure has been proposed as a structure for closing the opening of the radiation shielding wall.
Patent Document 1 discloses a structure in which an opening can be opened and closed by attaching and detaching a plug to and from an opening of a radiation shielding wall. A step is formed in the opening, and a wheel is provided in the plug. In Patent Document 1, the plug is run on the floor surface and fitted into the opening, so that the plug is locked to the stepped portion and the opening is closed. On the other hand, the opening is opened by running the plug on the floor and removing it from the opening.

Patent Document 2 discloses a structure in which an opening of a radiation shielding wall is closed with mortar. The lower end surface constituting the opening is horizontal, and the upper end surface is inclined. The mold is arranged on both sides of the wall so as to cover the opening, and the interior space surrounded by the wall and the mold is filled with mortar, thereby closing the opening with the cured mortar.
However, in the structures such as Patent Documents 1 and 2, since the plug and the hardened mortar are locked to the wall and are not integrated with the wall, there is a risk of dropping off the wall.
Patent Document 3 discloses a radiation shielding wall in which a temporary opening having a convex portion at the lower end and a concave portion at the upper end is closed with a block wall in which a plurality of bowl-shaped blocks are stacked in a side view. These saddle-shaped blocks have a convex portion at the lower end and a concave portion at the upper end in a side view. In this radiation shielding wall, the wall of the block which closes the temporary opening is not arranged, so that the block wall is mechanically fragile.

JP 2002-214387 A JP 2001-343479 A Japanese Patent No. 4649289

  It is an object of the present invention to provide a radiation shielding wall opening closing structure capable of firmly integrating a radiation shielding wall and a reinforced concrete body closing the opening of the radiation shielding wall.

The present inventors closed the radiation shield wall opening with reinforced concrete, and then closed the opening with new reinforced concrete, the fixing connected to the reinforced joint part and the reinforced joint part along the opening. By attaching an opening frame with a reinforcing bar and closing the inside of the opening frame with reinforced concrete, the reinforced concrete can be suspended without damaging the wall frame, although it is a relatively easy structure. And it came to the present invention focusing on the point that a new reinforced concrete body can be easily formed to shield radiation.
The radiation shielding wall opening blocking structure according to the first aspect of the invention blocks an opening (for example, an opening 10 described later) provided in a radiation shielding wall (for example, a radiation blocking wall 1 described later) that shields radiation. In the opening blocking structure, the opening of the radiation shielding wall includes an opening frame (for example, an opening frame 20 described later) extending along three sides excluding the four sides or the lower side of the opening, and the opening frame. A reinforced concrete body (for example, a reinforced concrete body 30 described later) that closes the opening including the frame main body (for example, frame main bodies 21 and 21B described later) that covers an end surface that constitutes the opening. ), A reinforcing bar joint part (for example, a reinforcing bar joint part 22 described later) provided in the frame body, and a fixing reinforcing bar (for example, a fixing part described later) joined to the reinforcing bar joint part and fixed in the radiation shielding wall. Rebar 23) and The reinforced concrete body includes a concrete part (for example, a concrete part 31 described later) that closes the opening, and a wall reinforcement (for example, a wall that is described later) embedded in the concrete part and joined to the reinforced joint part. And a streak 32).

  According to this invention, the opening frame provided with the reinforcing bar joint portion and the fixing reinforcing bar is provided on the end surface constituting the opening. Therefore, the opening part of a radiation shielding wall can be obstruct | occluded with a reinforced concrete body by joining the wall reinforcement arranged in the opening part to the reinforcing bar joint part, and then placing concrete in this opening part. Therefore, the wall bars embedded in the reinforced concrete body are joined to the fixed reinforcing bars fixed to the radiation shielding wall via the reinforcing bar joint portion, so that the radiation shielding wall and the reinforced concrete body can be firmly integrated. Further, even when the radiation shielding wall has a curved surface shape or when the wall thickness is extremely thick, the radiation shielding performance can be secured relatively easily.

In addition, since the opening frame is provided in the opening, the edge of the radiation shielding wall concrete and the concrete of the reinforced concrete body is cut by the opening frame, so that the reinforced concrete can be relatively easily made without damaging the radiation shielding wall concrete. The body can be removed and removed.
In addition, even after the reinforced concrete body has been removed, the openings can be closed again with the reinforced concrete body by connecting the wall bars to the reinforced joints and placing the bars again and placing concrete. is there.

In the opening blocking structure for the radiation shielding wall according to the second invention, a step portion (for example, a concave portion 25A and a convex portion 25B described later) is formed between the inner end side and the outer end side of the frame body. It is characterized by that.
According to this invention, since the step portion is provided in the frame main body of the opening frame, the portion that is locked to the step portion of the reinforced concrete body that closes the inside of the opening frame transmits the shearing force in the out-of-plane direction ( It functions as a shear key. Therefore, the radiation shielding wall and the reinforced concrete body can be integrated more firmly.

The opening blocking structure for the radiation shielding wall according to the third aspect of the present invention is such that the concrete portion (for example, a concrete portion 31 described later) has a plurality of concrete blocks (for example, a concrete block 33 described later) arranged along the frame body. And an on-site cast concrete part formed by placing concrete in the opening (for example, a first on-site cast concrete part 34 and a second on-site cast concrete part 35 described later), The concrete block is characterized in that the compressive strength is higher than that of the concrete placed on site.
According to the present invention, since the concrete block arranged along the frame body of the opening is higher in strength than the on-site cast concrete part formed in the opening, the high-strength concrete block serves as a resistor, and radiation shielding The reinforced concrete body closing the opening can be removed without damaging the wall frame around the opening of the wall.

  According to the present invention, the radiation shielding wall and the reinforced concrete body closing the opening of the radiation shielding wall can be firmly integrated.

It is a front view of the radiation shielding wall concerning a 1st embodiment of the present invention. It is AA sectional drawing of the radiation shielding wall shown in FIG. It is BB sectional drawing of the radiation shielding wall shown in FIG. It is a flowchart of the construction procedure which obstruct | occludes the opening part of the radiation shielding wall of 1st Embodiment. It is the fragmentary perspective view of the part containing the opening frame of the radiation shielding wall which concerns on 2nd Embodiment of this invention, a horizontal sectional view, and CC sectional drawing. It is a longitudinal cross-sectional view of the opening part of the radiation shielding wall which concerns on the modification of this invention. It is a front view of the radiation shielding wall which concerns on 3rd Embodiment of this invention. It is DD sectional drawing of the radiation shielding wall shown in FIG. It is EE sectional drawing of the radiation shielding wall shown in FIG. It is a flowchart of the construction procedure which obstruct | occludes the opening part of the radiation shielding wall of 3rd Embodiment.

In the present invention, when the opening of the radiation shielding wall is closed with reinforced concrete, and then the opening is closed with new reinforced concrete, the reinforced concrete can be suspended without damaging the wall frame. It is an opening blockage structure of a radiation shielding wall in which a simple reinforced concrete body can be easily formed.
In the first embodiment of the present invention, an opening frame including a reinforcing bar joint portion and a fixing reinforcing bar connected to the reinforcing bar joint portion is provided along three sides excluding the four sides or the lower side of the opening portion. It is the opening part obstruction | occlusion structure which obstruct | occluded the inside of this with the reinforced concrete body (FIGS. 1-4). The second embodiment is an opening closing structure different from the first embodiment only in that a shear key mechanism such as a reinforcing bar or steel material that bears transmission of shearing force is provided in the recess of the opening frame (FIGS. 5 and 5). 6). 3rd Embodiment is an opening part obstruction | occlusion structure which has arrange | positioned the high-strength concrete block along the opening frame of an opening part, and laid concrete on the spot between the concrete blocks (FIGS. 7-10).
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
[First Embodiment]
FIG. 1 is a front view of a radiation shielding wall 1 according to the first embodiment of the present invention. 2 is an AA cross-sectional view of the radiation shielding wall 1 of FIG. 1, and FIG. 3 is a BB cross-sectional view of the radiation shielding wall 1 of FIG.

The radiation shielding wall 1 is a reinforced concrete wall provided on the floor surface 2 for shielding radiation, and a rectangular housing 10 of the radiation shielding wall 1 is provided with a rectangular opening 10. .
The opening 10 of the radiation shielding wall 1 is provided with a rectangular frame-shaped opening frame 20 extending along the four sides of the opening 10 and a reinforced concrete body 30 that closes the opening 10 including the opening frame 20. .
The opening frame 20 includes a rectangular frame-shaped frame main body 21 covering an end surface constituting the opening 10, a reinforcing bar joint portion 22 provided on the frame main body 21, and a wall of the radiation shielding wall 1 joined to the reinforcing bar joint portion 22. A fixing rebar 23 fixed in the housing 3.

The frame main body 21 includes a pair of frame members 24A that covers the end surfaces on both sides of the opening 10 and extends in the vertical direction, and a pair of frame members 24B that covers the upper and lower end surfaces of the opening 10 and extends in the horizontal direction. The
The frame member 24A is formed by bending a steel plate, and a recess 25A is formed between the inner end side and the outer end side as a stepped portion recessed on the radiation shielding wall 1 side. The frame member 24B is formed by bending a steel plate, and a convex portion 25B as a stepped portion protruding toward the opening 10 is formed between the inner end side and the outer end side.

The reinforcing bar joint portion 22 has a cylindrical shape, is welded and fixed to the radiation shielding wall 1 side of the frame body 21, and is embedded in the housing of the radiation shielding wall 1. Examples of the reinforcing bar joint portion 22 include a torque fixing type coupler and a high nut. The reinforcing bar joint portions 22 are arranged at predetermined intervals in two rows on both sides of the concave portion 25A or the convex portion 25B of the frame body 21. The frame body 21 is formed with a through hole 26 that communicates with the reinforcing bar joint portion 22.
The fixing reinforcing bar 23 is embedded in the housing of the radiation shielding wall 1. The fixing reinforcing bar 23 has a predetermined length, and the distal end side of the fixing reinforcing bar 23 is joined to the reinforcing bar joint portion 22.

  The reinforced concrete body 30 includes a concrete portion 31 that closes the opening 10, and lattice-like wall bars 32 that are embedded in the concrete portion 31 and joined to the reinforced joint portion 22. The front end side of the wall reinforcement 32 is joined to the reinforcing bar joint portion 22.

The construction procedure for closing the opening 10 of the radiation shielding wall 1 will be described with reference to the flowchart of FIG.
As an initial state, when the radiation shielding wall 1 is constructed, the opening frame 20 is driven into the opening 10. At this time, the opening frame 20 functions as a mold for the opening 10.
In step S <b> 1, the wall bars 32 are double-arranged in a lattice shape in the opening 10, and the end portions of the wall bars 32 are joined to the reinforcing bar joint portion 22.
In step S <b> 2, a pair of molds (not shown) are built on both side surfaces of the opening 10 of the radiation shielding wall 1.
In step S <b> 3, concrete is placed between the pair of molds and in the space inside the opening 10 to construct the reinforced concrete body 30.

According to this embodiment, there are the following effects.
(1) The opening frame 20 including the reinforcing bar joint portion 22 and the fixing reinforcing bar 23 is provided on the end face of the opening portion 10. Therefore, the wall reinforcement 32 arranged in the opening 10 is joined to the reinforcing bar joint 22, and then concrete is placed in the opening 10, so that the opening 10 of the radiation shielding wall 1 is made of the reinforced concrete body 30. Can be blocked. Therefore, the wall reinforcement 32 embedded in the reinforced concrete body 30 is joined to the fixing reinforcement 23 fixed to the radiation shielding wall via the reinforcement joint portion 22, so that the radiation shielding wall 1 and the reinforced concrete body 30 are firmly integrated. Can be Further, even when the radiation shielding wall 1 has a curved surface shape or when the wall thickness is extremely thick, the radiation shielding performance can be secured relatively easily.

(2) By providing the opening frame 20 on the end face of the opening 10, the wall frame 3 around the opening 10 of the radiation shielding wall 1 by the opening frame 20, and the concrete of the reinforced concrete body 30 that closes the opening 10 Therefore, the reinforced concrete body 30 can be suspended and removed relatively easily without damaging the concrete of the radiation shielding wall 1.
In addition, even after the reinforced concrete body 30 is removed once, the wall reinforcement 32 is again arranged in the opening 10 and the wall reinforcement 32 is joined to the reinforcement joint 22 so that the reinforced concrete body again. 30 can close the opening 10.
Further, since the reinforcing bar joint 22 is fixed to the frame main body 21 by welding and the frame main body 21 is arranged so as to cover the end face of the opening 10, the concrete in the opening 10 is removed, and then the opening 10 is newly added. When arranging the wall bars 32, the ends of the wall bars 32 are joined to the reinforcing bar joint portion 22, thereby arranging the wall bars continuously over the wall frame 3 and the opening 10 around the opening 10. I can do it. Further, since the recess 25A is formed between the inner end side and the outer end side of the frame main body 21, the radiation from the inside to the outside of the radiation shielding wall 1 can be effectively shielded.

  (3) Since the concave body 25A or the convex part 25B is provided in the frame main body 21 of the opening frame 20, the portion of the reinforced concrete body 30 that is locked to the concave part 25A or the convex part 25B transmits the shearing force in the out-of-plane direction Functions as a (shear key). Therefore, the wall housing 3 around the opening 10 of the radiation shielding wall 1 and the reinforced concrete body 30 closing the opening 10 can be integrated more firmly.

[Second Embodiment]
FIG. 5A is a perspective view of a portion including the opening frame 20 of the radiation shielding wall 1A according to the second embodiment of the present invention. FIG. 5B is a horizontal sectional view of a portion including the opening frame 20 of the radiation shielding wall 1A. FIG. 5C is a C-C cross-sectional view of a portion including the opening frame 20 of the radiation shielding wall 1A shown in FIGS. 5A and 5B.
In this embodiment, the point which provided the reinforcing bar 40 in the recessed part 25A of the opening frame 20 differs from 1st Embodiment.
That is, the reinforcing bar 40 extending in the horizontal direction is fixed to the bottom surface of the recess 25A of the opening frame 20 by welding. Not only this but as shown in FIG. 6, the angle steel 41 extended in a horizontal direction may be fixed to the bottom face of the recessed part 25A of the opening frame 20 by welding.

According to this embodiment, in addition to the effects (1) to (3) described above, the following effects can be obtained.
(4) Since the reinforcing bar 40 is welded and fixed to the bottom surface of the concave portion 25A of the opening frame 20, the reinforcing bar 40 exerts a shearing force in the in-plane direction, that is, in the vertical direction, on the portion locked to the concave portion 25A of the reinforced concrete body 30. Functions as a transmission mechanism (shear key).

[Third Embodiment]
FIG. 7 is a front view of the radiation shielding wall 1B according to the third embodiment of the present invention. 8 is a DD cross-sectional view of the radiation shielding wall 1B of FIG. 7, and FIG. 9 is an EE cross-sectional view of the radiation shielding wall 1B of FIG.
In the present embodiment, the structure of the frame main body 21B of the opening frame 20 and the structure of the concrete portion 31B of the reinforced concrete body 30 are different from those of the first embodiment.

That is, the frame main body 21B of the opening frame 20 is not provided with the concave portion 25A or the convex portion 25B of the first embodiment, and is linear in a sectional view.
In addition, the concrete portion 31B of the reinforced concrete body 30 is formed up to a predetermined height of the opening 10 with a plurality of concrete blocks 33 arranged on both sides of the opening 10 and portions along the frame main body 21B on the lower end surface. A first on-site cast concrete portion; and a second on-site cast concrete portion formed between the upper surface of the first on-site cast concrete portion and the upper end surface of the opening.

  The concrete block 33 has a rectangular parallelepiped shape, and is disposed between the wall bars 32 that have been double-arranged in the radiation shielding wall 1B wall thickness direction (out-of-plane direction) and outside the wall bars 32. Further, the concrete block 33 has a higher compressive strength than the first on-site cast concrete part 34, the second on-site cast concrete part 35, and the wall frame 3 around the opening 10 of the radiation shielding wall 1B.

The construction procedure for closing the opening 10 of the radiation shielding wall 1B will be described with reference to the flowchart of FIG.
As an initial state, the opening frame 20 is driven into the opening 10 when the radiation shielding wall 1B is constructed. At this time, the opening frame 20 functions as a mold for the opening 10.
In step S <b> 11, the wall bars 32 are double-arranged in a lattice shape in the opening 10, and the ends of the wall bars 32 are joined to the reinforcing bar joint portion 22. Moreover, the concrete block 33 is arrange | positioned along the frame main body 21B of the both end surfaces of the opening part 10, and a lower side.
In step S <b> 12, a pair of molds (not shown) are built on both side surfaces of the opening 10 of the radiation shielding wall 1.
In step S <b> 13, concrete is cast up to a predetermined height in the space inside the opening 10 between the pair of molds to form the first on-site cast concrete part 34. At this time, when concrete is placed in the space inside the opening 10, the concrete flows between the concrete blocks 33 and hardens, and the end portion of the first on-site placement concrete portion 34 has a convex shape.
In step S <b> 14, concrete is placed between the upper surface of the first site placement concrete part 34 and the upper end surface of the opening 10 to form the second site placement concrete part 35.

According to this embodiment, in addition to the effects (1) and (2) described above, the following effects can be obtained.
(5) The concrete block 33 was arrange | positioned between the wall reinforcements 32 by which double reinforcement was arranged, and the outer side of each wall reinforcement 32. FIG. Although the concrete block 33 is in contact with the frame main body 21B, it is not fixed. Therefore, when the reinforced concrete body 30 is removed, the reinforced concrete body 30 can be easily removed.
(6) The concrete block 33 provided in contact with the frame main body 21B of the opening 10 includes a first on-site cast concrete part 34, a second on-site cast concrete part 35, and a radiation shielding wall 1B formed in the opening 10. Therefore, when the reinforced concrete body 30 of the opening 10 is suspended, the high-strength concrete block 33 serves as a resistor, and the wall housing 3 of the radiation shielding wall 1B. The reinforced concrete body 30 in the opening 10 can be removed without damaging the surface.

  Note that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope in which the object of the present invention can be achieved are included in the present invention.

DESCRIPTION OF SYMBOLS 1, 1A, 1B ... Radiation shielding wall 2 ... Floor surface 3 ... Wall housing 10 ... Opening part 20 ... Opening frame 21, 21B ... Frame main body 22 ... Reinforcement joint part 23 ... Fixing reinforcing bar 24A, 24B ... Frame member 25A ... Recess 25B ... Convex part 26 ... Through hole 30 ... Reinforced concrete body 31, 31B ... Concrete part 32 ... Wall reinforcement 33 ... Concrete block 34 ... First site placement concrete part 35 ... Second site placement concrete part 40 ... Reinforcement 41 ... Yamagata steel

Claims (3)

An opening closing structure for closing an opening provided in a radiation shielding wall for shielding radiation,
The opening of the radiation shielding wall is provided with an opening frame extending along three sides excluding the four sides or the lower side of the opening, and a reinforced concrete body that closes the opening including the opening frame,
The opening frame includes a frame main body that covers an end surface constituting the opening, a reinforcing bar joint provided in the frame main body, a fixing reinforcing bar that is bonded to the reinforcing bar joint and is fixed in the radiation shielding wall. With
The said reinforced concrete body is equipped with the concrete part which obstruct | occludes the said opening part, and the wall reinforcement embed | buried in the said concrete part and joined to the said reinforced joint part, The opening part obstruction | occlusion structure of the radiation shielding wall characterized by the above-mentioned.   2. The radiation shielding wall opening blocking structure according to claim 1, wherein a step portion is formed between an inner end side and an outer end side of the frame main body. The concrete portion includes a plurality of concrete blocks arranged along the frame main body, and an on-site placement concrete portion formed by placing concrete in the opening,
3. The radiation blocking wall opening blockage structure according to claim 1, wherein the concrete block has higher compressive strength than the on-site cast concrete portion.

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